I am not sure why food including coffee is treated as luxury. It can be some contraction in consumption but people still have habits of drinking coffee. Even if everything is open(bars/restaurants) you do not drink coffee more than your body need.The same you do at home. Many people work from home now but they still drink coffee.
From article below:
"In the 13 weeks ending June 27, 1 million more coffee and espresso makers sold and half a million more electric grills and griddles sold compared to the same period last year, according to NPD Group data."